3.The sealing ring has long service life
(1)When adopting the self-sealing design concept, the small interference between rubber ring and stainless steel valve seat is just to maintain the initial sealing condition. Thus the pressure for sealing is increased with the increasing system pressure.
(2) In addition, there is a so called “breath” groove for elastic concession of rubber in the zigzag groove, which makes the rubber have enough space for expanding and contracting when it is under stress. Thus the rubber won’ t have elastic fatigue in the long working time and the service life of the sealing ring is much longer than the traditional type.
Patented design: taper pin structure
Generally, the
flanged butterfly valve adopts the traditional pin connection that the pin passes through the valve shaft, not only reducing the strength of valve shaft, but also leading to the gap between the pin and the valve shaft in the long-term use process. It causes the impulse load when we open and close the valves, which far exceeds the load caused by crushing and shearing stress in the normal situation. It finally makes the pin to be seriously deformed or broken, the valve to be invalid or to loosely shut down and shortens the service life of valves. If the pin connection between valve clack and valve shaft is replaced with the taper pin of the American design patent, the taper pin will not pass through the shaft center and not reduce the strength of shaft. It will greatly enlarge the faying surface of valve shaft. By tightening the nuts of taper pin, it will produce pretightening force between the taper pin and the valve shaft, making the clack closely connected with the shaft without a little gap. When open or close the valve, it will not produce any impulse load, so the valve clack will turn stably and finally realize the reliable sealing.
Unique axial adjustment locking device at the bottom
For the butterfly valves with specification above DN300, considering the reliability of butterfly plate sealing, locates the valve clack in the position with its best sealing performance by accurate adjustment and fixation of axial position. For valve clack droop resulted in the long-term service, you can further adjust and fasten the device to achieve the result of free leakage.
Convenient replacement of sealing rings
When change the sealing ring, it is unnecessary to dismantle the valve clack. It only needs to completely open the valve, and then take out the key of the operating gear, making the operating gear adjusted to the closing state and connected with the main valve key. When continue to turn the hand wheel toward the opening direction, you can replace the sealing ring until the sealing ring arrives at the opposite side of the valve sealing surface.